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<title>Closure Unit Tests - goog.math.ExponentialBackoff</title>
<script src="../base.js"></script>
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goog.require('goog.math.ExponentialBackoff');
goog.require('goog.testing.jsunit');
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var INITIAL_VALUE = 1;

var MAX_VALUE = 10;

function assertValueAndCount(value, count, backoff) {
  assertEquals('Wrong value', value, backoff.getValue());
  assertEquals('Wrong backoff count', count, backoff.getBackoffCount());
}


function createBackoff() {
  return new goog.math.ExponentialBackoff(INITIAL_VALUE, MAX_VALUE);
}


function testInitialState() {
  var backoff = createBackoff();
  assertValueAndCount(INITIAL_VALUE, 0, backoff);
}


function testBackoff() {
  var backoff = createBackoff();
  backoff.backoff();
  assertValueAndCount(2 /* value */, 1 /* count */, backoff);
  backoff.backoff();
  assertValueAndCount(4 /* value */, 2 /* count */, backoff);
  backoff.backoff();
  assertValueAndCount(8 /* value */, 3 /* count */, backoff);
  backoff.backoff();
  assertValueAndCount(MAX_VALUE, 4 /* count */, backoff);
  backoff.backoff();
  assertValueAndCount(MAX_VALUE, 5 /* count */, backoff);
}


function testReset() {
  var backoff = createBackoff();
  backoff.backoff();
  backoff.reset();
  assertValueAndCount(INITIAL_VALUE, 0 /* count */, backoff);

}

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